Feel like I'm the only one who couldn't get through Thinking, Fast and Slow. Felt like a rambling slog, with most of the interesting bits being something that was very common sense to me.
When did you read the book? It seems to me that the ideas within the book now pervade culture in ways that it didn't when it first came out. If you read it recently it could contribute to your feeling of this being common sense. Also because this idea feels like common sense doesn't mean that it was. Evolution is common sense now but it was a revolutionary way to think of species when On The Origin Of Species came out.
I had the same reaction tbh. I managed to get to the end, but it was a slow, tedious slog. And maybe it's because I'd already read a lot of other pop-psych books, but I barely felt like I learned anything new from it.
That aside, I don't doubt that Kahneman was a brilliant mind, and I'm saddened by his passing. RIP.